2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/buffer_head.h>
21 #include <linux/pagemap.h>
22 #include <linux/highmem.h>
23 #include <linux/time.h>
24 #include <linux/init.h>
25 #include <linux/string.h>
26 #include <linux/smp_lock.h>
27 #include <linux/backing-dev.h>
28 #include <linux/mpage.h>
29 #include <linux/swap.h>
30 #include <linux/writeback.h>
31 #include <linux/statfs.h>
32 #include <linux/compat.h>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
35 #include <linux/xattr.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
43 struct btrfs_iget_args {
45 struct btrfs_root *root;
48 static struct inode_operations btrfs_dir_inode_operations;
49 static struct inode_operations btrfs_symlink_inode_operations;
50 static struct inode_operations btrfs_dir_ro_inode_operations;
51 static struct inode_operations btrfs_special_inode_operations;
52 static struct inode_operations btrfs_file_inode_operations;
53 static struct address_space_operations btrfs_aops;
54 static struct address_space_operations btrfs_symlink_aops;
55 static struct file_operations btrfs_dir_file_operations;
56 static struct extent_map_ops btrfs_extent_map_ops;
58 static struct kmem_cache *btrfs_inode_cachep;
59 struct kmem_cache *btrfs_trans_handle_cachep;
60 struct kmem_cache *btrfs_transaction_cachep;
61 struct kmem_cache *btrfs_bit_radix_cachep;
62 struct kmem_cache *btrfs_path_cachep;
65 static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
66 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
67 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
68 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
69 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
70 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
71 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
72 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
75 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
77 struct btrfs_root *root = BTRFS_I(inode)->root;
78 struct btrfs_trans_handle *trans;
83 u64 blocksize = root->sectorsize;
85 mutex_lock(&root->fs_info->fs_mutex);
86 trans = btrfs_start_transaction(root, 1);
87 btrfs_set_trans_block_group(trans, inode);
89 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
90 ret = btrfs_drop_extents(trans, root, inode,
91 start, start + num_bytes, start, &alloc_hint);
93 if (alloc_hint == EXTENT_MAP_INLINE)
96 ret = btrfs_alloc_extent(trans, root, num_bytes,
97 root->root_key.objectid, trans->transid,
98 inode->i_ino, start, 0,
99 alloc_hint, (u64)-1, &ins, 1);
104 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
105 start, ins.objectid, ins.offset,
108 btrfs_end_transaction(trans, root);
109 mutex_unlock(&root->fs_info->fs_mutex);
113 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
115 struct inode *inode = page->mapping->host;
116 struct btrfs_root *root = BTRFS_I(inode)->root;
117 struct btrfs_trans_handle *trans;
120 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
121 size_t offset = start - page_start;
123 if (btrfs_test_opt(root, NODATASUM))
126 mutex_lock(&root->fs_info->fs_mutex);
127 trans = btrfs_start_transaction(root, 1);
128 btrfs_set_trans_block_group(trans, inode);
130 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
131 start, kaddr + offset, end - start + 1);
133 ret = btrfs_end_transaction(trans, root);
135 mutex_unlock(&root->fs_info->fs_mutex);
139 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
142 struct inode *inode = page->mapping->host;
143 struct btrfs_root *root = BTRFS_I(inode)->root;
144 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
145 struct btrfs_csum_item *item;
146 struct btrfs_path *path = NULL;
149 if (btrfs_test_opt(root, NODATASUM))
152 mutex_lock(&root->fs_info->fs_mutex);
153 path = btrfs_alloc_path();
154 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
157 /* a csum that isn't present is a preallocated region. */
158 if (ret == -ENOENT || ret == -EFBIG)
163 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
165 set_state_private(em_tree, start, csum);
168 btrfs_free_path(path);
169 mutex_unlock(&root->fs_info->fs_mutex);
173 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
175 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
176 struct inode *inode = page->mapping->host;
177 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
181 struct btrfs_root *root = BTRFS_I(inode)->root;
185 if (btrfs_test_opt(root, NODATASUM))
188 ret = get_state_private(em_tree, start, &private);
189 local_irq_save(flags);
190 kaddr = kmap_atomic(page, KM_IRQ0);
194 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
195 btrfs_csum_final(csum, (char *)&csum);
196 if (csum != private) {
199 kunmap_atomic(kaddr, KM_IRQ0);
200 local_irq_restore(flags);
204 printk("btrfs csum failed ino %lu off %llu\n",
205 page->mapping->host->i_ino, (unsigned long long)start);
206 memset(kaddr + offset, 1, end - start + 1);
207 flush_dcache_page(page);
208 kunmap_atomic(kaddr, KM_IRQ0);
209 local_irq_restore(flags);
213 void btrfs_read_locked_inode(struct inode *inode)
215 struct btrfs_path *path;
216 struct extent_buffer *leaf;
217 struct btrfs_inode_item *inode_item;
218 struct btrfs_inode_timespec *tspec;
219 struct btrfs_root *root = BTRFS_I(inode)->root;
220 struct btrfs_key location;
221 u64 alloc_group_block;
225 path = btrfs_alloc_path();
227 mutex_lock(&root->fs_info->fs_mutex);
229 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
230 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
234 leaf = path->nodes[0];
235 inode_item = btrfs_item_ptr(leaf, path->slots[0],
236 struct btrfs_inode_item);
238 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
239 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
240 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
241 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
242 inode->i_size = btrfs_inode_size(leaf, inode_item);
244 tspec = btrfs_inode_atime(inode_item);
245 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
246 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
248 tspec = btrfs_inode_mtime(inode_item);
249 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
250 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
252 tspec = btrfs_inode_ctime(inode_item);
253 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
254 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
256 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
257 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
259 rdev = btrfs_inode_rdev(leaf, inode_item);
261 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
262 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
265 btrfs_free_path(path);
268 mutex_unlock(&root->fs_info->fs_mutex);
270 switch (inode->i_mode & S_IFMT) {
272 inode->i_mapping->a_ops = &btrfs_aops;
273 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
274 inode->i_fop = &btrfs_file_operations;
275 inode->i_op = &btrfs_file_inode_operations;
278 inode->i_fop = &btrfs_dir_file_operations;
279 if (root == root->fs_info->tree_root)
280 inode->i_op = &btrfs_dir_ro_inode_operations;
282 inode->i_op = &btrfs_dir_inode_operations;
285 inode->i_op = &btrfs_symlink_inode_operations;
286 inode->i_mapping->a_ops = &btrfs_symlink_aops;
289 init_special_inode(inode, inode->i_mode, rdev);
295 btrfs_release_path(root, path);
296 btrfs_free_path(path);
297 mutex_unlock(&root->fs_info->fs_mutex);
298 make_bad_inode(inode);
301 static void fill_inode_item(struct extent_buffer *leaf,
302 struct btrfs_inode_item *item,
305 btrfs_set_inode_uid(leaf, item, inode->i_uid);
306 btrfs_set_inode_gid(leaf, item, inode->i_gid);
307 btrfs_set_inode_size(leaf, item, inode->i_size);
308 btrfs_set_inode_mode(leaf, item, inode->i_mode);
309 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
311 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
312 inode->i_atime.tv_sec);
313 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
314 inode->i_atime.tv_nsec);
316 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
317 inode->i_mtime.tv_sec);
318 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
319 inode->i_mtime.tv_nsec);
321 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
322 inode->i_ctime.tv_sec);
323 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
324 inode->i_ctime.tv_nsec);
326 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
327 btrfs_set_inode_generation(leaf, item, inode->i_generation);
328 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
329 btrfs_set_inode_block_group(leaf, item,
330 BTRFS_I(inode)->block_group->key.objectid);
333 int btrfs_update_inode(struct btrfs_trans_handle *trans,
334 struct btrfs_root *root,
337 struct btrfs_inode_item *inode_item;
338 struct btrfs_path *path;
339 struct extent_buffer *leaf;
342 path = btrfs_alloc_path();
344 ret = btrfs_lookup_inode(trans, root, path,
345 &BTRFS_I(inode)->location, 1);
352 leaf = path->nodes[0];
353 inode_item = btrfs_item_ptr(leaf, path->slots[0],
354 struct btrfs_inode_item);
356 fill_inode_item(leaf, inode_item, inode);
357 btrfs_mark_buffer_dirty(leaf);
358 btrfs_set_inode_last_trans(trans, inode);
361 btrfs_release_path(root, path);
362 btrfs_free_path(path);
367 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
368 struct btrfs_root *root,
370 struct dentry *dentry)
372 struct btrfs_path *path;
373 const char *name = dentry->d_name.name;
374 int name_len = dentry->d_name.len;
376 struct extent_buffer *leaf;
377 struct btrfs_dir_item *di;
378 struct btrfs_key key;
380 path = btrfs_alloc_path();
386 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
396 leaf = path->nodes[0];
397 btrfs_dir_item_key_to_cpu(leaf, di, &key);
398 ret = btrfs_delete_one_dir_name(trans, root, path, di);
401 btrfs_release_path(root, path);
403 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
404 key.objectid, name, name_len, -1);
413 ret = btrfs_delete_one_dir_name(trans, root, path, di);
415 dentry->d_inode->i_ctime = dir->i_ctime;
416 ret = btrfs_del_inode_ref(trans, root, name, name_len,
417 dentry->d_inode->i_ino,
418 dentry->d_parent->d_inode->i_ino);
420 printk("failed to delete reference to %.*s, "
421 "inode %lu parent %lu\n", name_len, name,
422 dentry->d_inode->i_ino,
423 dentry->d_parent->d_inode->i_ino);
426 btrfs_free_path(path);
428 dir->i_size -= name_len * 2;
429 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
430 btrfs_update_inode(trans, root, dir);
431 drop_nlink(dentry->d_inode);
432 ret = btrfs_update_inode(trans, root, dentry->d_inode);
433 dir->i_sb->s_dirt = 1;
438 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
440 struct btrfs_root *root;
441 struct btrfs_trans_handle *trans;
445 root = BTRFS_I(dir)->root;
446 mutex_lock(&root->fs_info->fs_mutex);
447 trans = btrfs_start_transaction(root, 1);
449 btrfs_set_trans_block_group(trans, dir);
450 ret = btrfs_unlink_trans(trans, root, dir, dentry);
451 nr = trans->blocks_used;
453 btrfs_end_transaction(trans, root);
454 mutex_unlock(&root->fs_info->fs_mutex);
455 btrfs_btree_balance_dirty(root, nr);
460 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
462 struct inode *inode = dentry->d_inode;
465 struct btrfs_root *root = BTRFS_I(dir)->root;
466 struct btrfs_trans_handle *trans;
469 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
472 mutex_lock(&root->fs_info->fs_mutex);
473 trans = btrfs_start_transaction(root, 1);
474 btrfs_set_trans_block_group(trans, dir);
476 /* now the directory is empty */
477 err = btrfs_unlink_trans(trans, root, dir, dentry);
482 nr = trans->blocks_used;
483 ret = btrfs_end_transaction(trans, root);
484 mutex_unlock(&root->fs_info->fs_mutex);
485 btrfs_btree_balance_dirty(root, nr);
492 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
493 struct btrfs_root *root,
496 struct btrfs_path *path;
501 path = btrfs_alloc_path();
503 ret = btrfs_lookup_inode(trans, root, path,
504 &BTRFS_I(inode)->location, -1);
508 ret = btrfs_del_item(trans, root, path);
509 btrfs_free_path(path);
514 * this can truncate away extent items, csum items and directory items.
515 * It starts at a high offset and removes keys until it can't find
516 * any higher than i_size.
518 * csum items that cross the new i_size are truncated to the new size
521 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
522 struct btrfs_root *root,
526 struct btrfs_path *path;
527 struct btrfs_key key;
528 struct btrfs_key found_key;
530 struct extent_buffer *leaf;
531 struct btrfs_file_extent_item *fi;
532 u64 extent_start = 0;
533 u64 extent_num_bytes = 0;
539 int extent_type = -1;
541 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
542 path = btrfs_alloc_path();
546 /* FIXME, add redo link to tree so we don't leak on crash */
547 key.objectid = inode->i_ino;
548 key.offset = (u64)-1;
552 btrfs_init_path(path);
554 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
559 BUG_ON(path->slots[0] == 0);
562 leaf = path->nodes[0];
563 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
564 found_type = btrfs_key_type(&found_key);
566 if (found_key.objectid != inode->i_ino)
569 if (found_type != BTRFS_CSUM_ITEM_KEY &&
570 found_type != BTRFS_DIR_ITEM_KEY &&
571 found_type != BTRFS_DIR_INDEX_KEY &&
572 found_type != BTRFS_EXTENT_DATA_KEY)
575 item_end = found_key.offset;
576 if (found_type == BTRFS_EXTENT_DATA_KEY) {
577 fi = btrfs_item_ptr(leaf, path->slots[0],
578 struct btrfs_file_extent_item);
579 extent_type = btrfs_file_extent_type(leaf, fi);
580 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
582 btrfs_file_extent_num_bytes(leaf, fi);
583 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
584 struct btrfs_item *item = btrfs_item_nr(leaf,
586 item_end += btrfs_file_extent_inline_len(leaf,
591 if (found_type == BTRFS_CSUM_ITEM_KEY) {
592 ret = btrfs_csum_truncate(trans, root, path,
596 if (item_end < inode->i_size) {
597 if (found_type == BTRFS_DIR_ITEM_KEY) {
598 found_type = BTRFS_INODE_ITEM_KEY;
599 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
600 found_type = BTRFS_CSUM_ITEM_KEY;
601 } else if (found_type) {
606 btrfs_set_key_type(&key, found_type);
607 btrfs_release_path(root, path);
610 if (found_key.offset >= inode->i_size)
616 /* FIXME, shrink the extent if the ref count is only 1 */
617 if (found_type != BTRFS_EXTENT_DATA_KEY)
620 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
622 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
625 btrfs_file_extent_num_bytes(leaf, fi);
626 extent_num_bytes = inode->i_size -
627 found_key.offset + root->sectorsize - 1;
628 btrfs_set_file_extent_num_bytes(leaf, fi,
630 num_dec = (orig_num_bytes -
631 extent_num_bytes) >> 9;
632 if (extent_start != 0) {
633 inode->i_blocks -= num_dec;
635 btrfs_mark_buffer_dirty(leaf);
638 btrfs_file_extent_disk_num_bytes(leaf,
640 /* FIXME blocksize != 4096 */
641 num_dec = btrfs_file_extent_num_bytes(leaf,
643 if (extent_start != 0) {
645 inode->i_blocks -= num_dec;
647 root_gen = btrfs_header_generation(leaf);
648 root_owner = btrfs_header_owner(leaf);
650 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
652 u32 newsize = inode->i_size - found_key.offset;
653 newsize = btrfs_file_extent_calc_inline_size(newsize);
654 ret = btrfs_truncate_item(trans, root, path,
660 ret = btrfs_del_item(trans, root, path);
666 btrfs_release_path(root, path);
668 ret = btrfs_free_extent(trans, root, extent_start,
671 root_gen, inode->i_ino,
672 found_key.offset, 0);
678 btrfs_release_path(root, path);
679 btrfs_free_path(path);
680 inode->i_sb->s_dirt = 1;
684 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
689 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
690 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
691 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
693 set_page_extent_mapped(page);
695 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
696 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
698 if (zero_start != PAGE_CACHE_SIZE) {
700 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
701 flush_dcache_page(page);
704 set_page_dirty(page);
705 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
711 * taken from block_truncate_page, but does cow as it zeros out
712 * any bytes left in the last page in the file.
714 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
716 struct inode *inode = mapping->host;
717 struct btrfs_root *root = BTRFS_I(inode)->root;
718 u32 blocksize = root->sectorsize;
719 pgoff_t index = from >> PAGE_CACHE_SHIFT;
720 unsigned offset = from & (PAGE_CACHE_SIZE-1);
725 if ((offset & (blocksize - 1)) == 0)
728 down_read(&root->snap_sem);
730 page = grab_cache_page(mapping, index);
733 if (!PageUptodate(page)) {
734 ret = btrfs_readpage(NULL, page);
736 if (!PageUptodate(page)) {
741 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
743 ret = btrfs_cow_one_page(inode, page, offset);
746 page_cache_release(page);
747 up_read(&BTRFS_I(inode)->root->snap_sem);
752 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
754 struct inode *inode = dentry->d_inode;
757 err = inode_change_ok(inode, attr);
761 if (S_ISREG(inode->i_mode) &&
762 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
763 struct btrfs_trans_handle *trans;
764 struct btrfs_root *root = BTRFS_I(inode)->root;
765 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
767 u64 mask = root->sectorsize - 1;
768 u64 pos = (inode->i_size + mask) & ~mask;
769 u64 block_end = attr->ia_size | mask;
773 if (attr->ia_size <= pos)
776 btrfs_truncate_page(inode->i_mapping, inode->i_size);
778 lock_extent(em_tree, pos, block_end, GFP_NOFS);
779 hole_size = (attr->ia_size - pos + mask) & ~mask;
781 mutex_lock(&root->fs_info->fs_mutex);
782 trans = btrfs_start_transaction(root, 1);
783 btrfs_set_trans_block_group(trans, inode);
784 err = btrfs_drop_extents(trans, root, inode,
785 pos, pos + hole_size, pos,
788 if (alloc_hint != EXTENT_MAP_INLINE) {
789 err = btrfs_insert_file_extent(trans, root,
791 pos, 0, 0, hole_size);
793 btrfs_end_transaction(trans, root);
794 mutex_unlock(&root->fs_info->fs_mutex);
795 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
800 err = inode_setattr(inode, attr);
804 void btrfs_delete_inode(struct inode *inode)
806 struct btrfs_trans_handle *trans;
807 struct btrfs_root *root = BTRFS_I(inode)->root;
811 truncate_inode_pages(&inode->i_data, 0);
812 if (is_bad_inode(inode)) {
817 mutex_lock(&root->fs_info->fs_mutex);
818 trans = btrfs_start_transaction(root, 1);
820 btrfs_set_trans_block_group(trans, inode);
821 ret = btrfs_truncate_in_trans(trans, root, inode);
824 ret = btrfs_delete_xattrs(trans, root, inode);
827 ret = btrfs_free_inode(trans, root, inode);
830 nr = trans->blocks_used;
832 btrfs_end_transaction(trans, root);
833 mutex_unlock(&root->fs_info->fs_mutex);
834 btrfs_btree_balance_dirty(root, nr);
838 nr = trans->blocks_used;
839 btrfs_end_transaction(trans, root);
840 mutex_unlock(&root->fs_info->fs_mutex);
841 btrfs_btree_balance_dirty(root, nr);
847 * this returns the key found in the dir entry in the location pointer.
848 * If no dir entries were found, location->objectid is 0.
850 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
851 struct btrfs_key *location)
853 const char *name = dentry->d_name.name;
854 int namelen = dentry->d_name.len;
855 struct btrfs_dir_item *di;
856 struct btrfs_path *path;
857 struct btrfs_root *root = BTRFS_I(dir)->root;
860 if (namelen == 1 && strcmp(name, ".") == 0) {
861 location->objectid = dir->i_ino;
862 location->type = BTRFS_INODE_ITEM_KEY;
863 location->offset = 0;
866 path = btrfs_alloc_path();
869 if (namelen == 2 && strcmp(name, "..") == 0) {
870 struct btrfs_key key;
871 struct extent_buffer *leaf;
875 key.objectid = dir->i_ino;
876 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
878 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
882 leaf = path->nodes[0];
883 slot = path->slots[0];
884 nritems = btrfs_header_nritems(leaf);
888 btrfs_item_key_to_cpu(leaf, &key, slot);
889 if (key.objectid != dir->i_ino ||
890 key.type != BTRFS_INODE_REF_KEY) {
893 location->objectid = key.offset;
894 location->type = BTRFS_INODE_ITEM_KEY;
895 location->offset = 0;
899 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
903 if (!di || IS_ERR(di)) {
906 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
908 btrfs_free_path(path);
911 location->objectid = 0;
916 * when we hit a tree root in a directory, the btrfs part of the inode
917 * needs to be changed to reflect the root directory of the tree root. This
918 * is kind of like crossing a mount point.
920 static int fixup_tree_root_location(struct btrfs_root *root,
921 struct btrfs_key *location,
922 struct btrfs_root **sub_root,
923 struct dentry *dentry)
925 struct btrfs_path *path;
926 struct btrfs_root_item *ri;
928 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
930 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
933 path = btrfs_alloc_path();
935 mutex_lock(&root->fs_info->fs_mutex);
937 *sub_root = btrfs_read_fs_root(root->fs_info, location,
940 if (IS_ERR(*sub_root))
941 return PTR_ERR(*sub_root);
943 ri = &(*sub_root)->root_item;
944 location->objectid = btrfs_root_dirid(ri);
945 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
946 location->offset = 0;
948 btrfs_free_path(path);
949 mutex_unlock(&root->fs_info->fs_mutex);
953 static int btrfs_init_locked_inode(struct inode *inode, void *p)
955 struct btrfs_iget_args *args = p;
956 inode->i_ino = args->ino;
957 BTRFS_I(inode)->root = args->root;
958 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
959 inode->i_mapping, GFP_NOFS);
963 static int btrfs_find_actor(struct inode *inode, void *opaque)
965 struct btrfs_iget_args *args = opaque;
966 return (args->ino == inode->i_ino &&
967 args->root == BTRFS_I(inode)->root);
970 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
971 struct btrfs_root *root)
974 struct btrfs_iget_args args;
978 inode = iget5_locked(s, objectid, btrfs_find_actor,
979 btrfs_init_locked_inode,
984 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
985 struct nameidata *nd)
987 struct inode * inode;
988 struct btrfs_inode *bi = BTRFS_I(dir);
989 struct btrfs_root *root = bi->root;
990 struct btrfs_root *sub_root = root;
991 struct btrfs_key location;
994 if (dentry->d_name.len > BTRFS_NAME_LEN)
995 return ERR_PTR(-ENAMETOOLONG);
997 mutex_lock(&root->fs_info->fs_mutex);
998 ret = btrfs_inode_by_name(dir, dentry, &location);
999 mutex_unlock(&root->fs_info->fs_mutex);
1002 return ERR_PTR(ret);
1005 if (location.objectid) {
1006 ret = fixup_tree_root_location(root, &location, &sub_root,
1009 return ERR_PTR(ret);
1011 return ERR_PTR(-ENOENT);
1012 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1015 return ERR_PTR(-EACCES);
1016 if (inode->i_state & I_NEW) {
1017 /* the inode and parent dir are two different roots */
1018 if (sub_root != root) {
1020 sub_root->inode = inode;
1022 BTRFS_I(inode)->root = sub_root;
1023 memcpy(&BTRFS_I(inode)->location, &location,
1025 btrfs_read_locked_inode(inode);
1026 unlock_new_inode(inode);
1029 return d_splice_alias(inode, dentry);
1032 static unsigned char btrfs_filetype_table[] = {
1033 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1036 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1038 struct inode *inode = filp->f_path.dentry->d_inode;
1039 struct btrfs_root *root = BTRFS_I(inode)->root;
1040 struct btrfs_item *item;
1041 struct btrfs_dir_item *di;
1042 struct btrfs_key key;
1043 struct btrfs_key found_key;
1044 struct btrfs_path *path;
1047 struct extent_buffer *leaf;
1050 unsigned char d_type;
1055 int key_type = BTRFS_DIR_INDEX_KEY;
1060 /* FIXME, use a real flag for deciding about the key type */
1061 if (root->fs_info->tree_root == root)
1062 key_type = BTRFS_DIR_ITEM_KEY;
1064 /* special case for "." */
1065 if (filp->f_pos == 0) {
1066 over = filldir(dirent, ".", 1,
1074 mutex_lock(&root->fs_info->fs_mutex);
1075 key.objectid = inode->i_ino;
1076 path = btrfs_alloc_path();
1079 /* special case for .., just use the back ref */
1080 if (filp->f_pos == 1) {
1081 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1083 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1085 leaf = path->nodes[0];
1086 slot = path->slots[0];
1087 nritems = btrfs_header_nritems(leaf);
1088 if (slot >= nritems) {
1089 btrfs_release_path(root, path);
1090 goto read_dir_items;
1092 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1093 btrfs_release_path(root, path);
1094 if (found_key.objectid != key.objectid ||
1095 found_key.type != BTRFS_INODE_REF_KEY)
1096 goto read_dir_items;
1097 over = filldir(dirent, "..", 2,
1098 2, found_key.offset, DT_DIR);
1105 btrfs_set_key_type(&key, key_type);
1106 key.offset = filp->f_pos;
1108 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1113 leaf = path->nodes[0];
1114 nritems = btrfs_header_nritems(leaf);
1115 slot = path->slots[0];
1116 if (advance || slot >= nritems) {
1117 if (slot >= nritems -1) {
1118 ret = btrfs_next_leaf(root, path);
1121 leaf = path->nodes[0];
1122 nritems = btrfs_header_nritems(leaf);
1123 slot = path->slots[0];
1130 item = btrfs_item_nr(leaf, slot);
1131 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1133 if (found_key.objectid != key.objectid)
1135 if (btrfs_key_type(&found_key) != key_type)
1137 if (found_key.offset < filp->f_pos)
1140 filp->f_pos = found_key.offset;
1142 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1144 di_total = btrfs_item_size(leaf, item);
1145 while(di_cur < di_total) {
1146 struct btrfs_key location;
1148 name_len = btrfs_dir_name_len(leaf, di);
1149 if (name_len < 32) {
1150 name_ptr = tmp_name;
1152 name_ptr = kmalloc(name_len, GFP_NOFS);
1155 read_extent_buffer(leaf, name_ptr,
1156 (unsigned long)(di + 1), name_len);
1158 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1159 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1161 over = filldir(dirent, name_ptr, name_len,
1166 if (name_ptr != tmp_name)
1171 di_len = btrfs_dir_name_len(leaf, di) +
1172 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1174 di = (struct btrfs_dir_item *)((char *)di + di_len);
1181 btrfs_release_path(root, path);
1182 btrfs_free_path(path);
1183 mutex_unlock(&root->fs_info->fs_mutex);
1187 int btrfs_write_inode(struct inode *inode, int wait)
1189 struct btrfs_root *root = BTRFS_I(inode)->root;
1190 struct btrfs_trans_handle *trans;
1194 mutex_lock(&root->fs_info->fs_mutex);
1195 trans = btrfs_start_transaction(root, 1);
1196 btrfs_set_trans_block_group(trans, inode);
1197 ret = btrfs_commit_transaction(trans, root);
1198 mutex_unlock(&root->fs_info->fs_mutex);
1204 * This is somewhat expensive, updating the tree every time the
1205 * inode changes. But, it is most likely to find the inode in cache.
1206 * FIXME, needs more benchmarking...there are no reasons other than performance
1207 * to keep or drop this code.
1209 void btrfs_dirty_inode(struct inode *inode)
1211 struct btrfs_root *root = BTRFS_I(inode)->root;
1212 struct btrfs_trans_handle *trans;
1214 mutex_lock(&root->fs_info->fs_mutex);
1215 trans = btrfs_start_transaction(root, 1);
1216 btrfs_set_trans_block_group(trans, inode);
1217 btrfs_update_inode(trans, root, inode);
1218 btrfs_end_transaction(trans, root);
1219 mutex_unlock(&root->fs_info->fs_mutex);
1222 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1223 struct btrfs_root *root,
1225 struct btrfs_block_group_cache *group,
1228 struct inode *inode;
1229 struct btrfs_inode_item *inode_item;
1230 struct btrfs_key *location;
1231 struct btrfs_path *path;
1235 path = btrfs_alloc_path();
1238 inode = new_inode(root->fs_info->sb);
1240 return ERR_PTR(-ENOMEM);
1242 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1243 inode->i_mapping, GFP_NOFS);
1244 BTRFS_I(inode)->root = root;
1250 group = btrfs_find_block_group(root, group, 0, 0, owner);
1251 BTRFS_I(inode)->block_group = group;
1253 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1257 inode->i_uid = current->fsuid;
1258 inode->i_gid = current->fsgid;
1259 inode->i_mode = mode;
1260 inode->i_ino = objectid;
1261 inode->i_blocks = 0;
1262 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1263 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1264 struct btrfs_inode_item);
1265 fill_inode_item(path->nodes[0], inode_item, inode);
1266 btrfs_mark_buffer_dirty(path->nodes[0]);
1267 btrfs_free_path(path);
1269 location = &BTRFS_I(inode)->location;
1270 location->objectid = objectid;
1271 location->offset = 0;
1272 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1274 insert_inode_hash(inode);
1277 btrfs_free_path(path);
1278 return ERR_PTR(ret);
1281 static inline u8 btrfs_inode_type(struct inode *inode)
1283 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1286 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1287 struct dentry *dentry, struct inode *inode)
1290 struct btrfs_key key;
1291 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1292 struct inode *parent_inode;
1294 key.objectid = inode->i_ino;
1295 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1298 ret = btrfs_insert_dir_item(trans, root,
1299 dentry->d_name.name, dentry->d_name.len,
1300 dentry->d_parent->d_inode->i_ino,
1301 &key, btrfs_inode_type(inode));
1303 ret = btrfs_insert_inode_ref(trans, root,
1304 dentry->d_name.name,
1307 dentry->d_parent->d_inode->i_ino);
1308 parent_inode = dentry->d_parent->d_inode;
1309 parent_inode->i_size += dentry->d_name.len * 2;
1310 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1311 ret = btrfs_update_inode(trans, root,
1312 dentry->d_parent->d_inode);
1317 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1318 struct dentry *dentry, struct inode *inode)
1320 int err = btrfs_add_link(trans, dentry, inode);
1322 d_instantiate(dentry, inode);
1330 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1331 int mode, dev_t rdev)
1333 struct btrfs_trans_handle *trans;
1334 struct btrfs_root *root = BTRFS_I(dir)->root;
1335 struct inode *inode;
1341 if (!new_valid_dev(rdev))
1344 mutex_lock(&root->fs_info->fs_mutex);
1345 trans = btrfs_start_transaction(root, 1);
1346 btrfs_set_trans_block_group(trans, dir);
1348 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1354 inode = btrfs_new_inode(trans, root, objectid,
1355 BTRFS_I(dir)->block_group, mode);
1356 err = PTR_ERR(inode);
1360 btrfs_set_trans_block_group(trans, inode);
1361 err = btrfs_add_nondir(trans, dentry, inode);
1365 inode->i_op = &btrfs_special_inode_operations;
1366 init_special_inode(inode, inode->i_mode, rdev);
1367 btrfs_update_inode(trans, root, inode);
1369 dir->i_sb->s_dirt = 1;
1370 btrfs_update_inode_block_group(trans, inode);
1371 btrfs_update_inode_block_group(trans, dir);
1373 nr = trans->blocks_used;
1374 btrfs_end_transaction(trans, root);
1375 mutex_unlock(&root->fs_info->fs_mutex);
1378 inode_dec_link_count(inode);
1381 btrfs_btree_balance_dirty(root, nr);
1385 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1386 int mode, struct nameidata *nd)
1388 struct btrfs_trans_handle *trans;
1389 struct btrfs_root *root = BTRFS_I(dir)->root;
1390 struct inode *inode;
1396 mutex_lock(&root->fs_info->fs_mutex);
1397 trans = btrfs_start_transaction(root, 1);
1398 btrfs_set_trans_block_group(trans, dir);
1400 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1406 inode = btrfs_new_inode(trans, root, objectid,
1407 BTRFS_I(dir)->block_group, mode);
1408 err = PTR_ERR(inode);
1412 btrfs_set_trans_block_group(trans, inode);
1413 err = btrfs_add_nondir(trans, dentry, inode);
1417 inode->i_mapping->a_ops = &btrfs_aops;
1418 inode->i_fop = &btrfs_file_operations;
1419 inode->i_op = &btrfs_file_inode_operations;
1420 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1421 inode->i_mapping, GFP_NOFS);
1422 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
1424 dir->i_sb->s_dirt = 1;
1425 btrfs_update_inode_block_group(trans, inode);
1426 btrfs_update_inode_block_group(trans, dir);
1428 nr = trans->blocks_used;
1429 btrfs_end_transaction(trans, root);
1430 mutex_unlock(&root->fs_info->fs_mutex);
1433 inode_dec_link_count(inode);
1436 btrfs_btree_balance_dirty(root, nr);
1440 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1441 struct dentry *dentry)
1443 struct btrfs_trans_handle *trans;
1444 struct btrfs_root *root = BTRFS_I(dir)->root;
1445 struct inode *inode = old_dentry->d_inode;
1450 if (inode->i_nlink == 0)
1454 mutex_lock(&root->fs_info->fs_mutex);
1455 trans = btrfs_start_transaction(root, 1);
1457 btrfs_set_trans_block_group(trans, dir);
1458 atomic_inc(&inode->i_count);
1459 err = btrfs_add_nondir(trans, dentry, inode);
1464 dir->i_sb->s_dirt = 1;
1465 btrfs_update_inode_block_group(trans, dir);
1466 err = btrfs_update_inode(trans, root, inode);
1471 nr = trans->blocks_used;
1472 btrfs_end_transaction(trans, root);
1473 mutex_unlock(&root->fs_info->fs_mutex);
1476 inode_dec_link_count(inode);
1479 btrfs_btree_balance_dirty(root, nr);
1483 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1485 struct inode *inode;
1486 struct btrfs_trans_handle *trans;
1487 struct btrfs_root *root = BTRFS_I(dir)->root;
1489 int drop_on_err = 0;
1491 unsigned long nr = 1;
1493 mutex_lock(&root->fs_info->fs_mutex);
1494 trans = btrfs_start_transaction(root, 1);
1495 btrfs_set_trans_block_group(trans, dir);
1497 if (IS_ERR(trans)) {
1498 err = PTR_ERR(trans);
1502 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1508 inode = btrfs_new_inode(trans, root, objectid,
1509 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1510 if (IS_ERR(inode)) {
1511 err = PTR_ERR(inode);
1516 inode->i_op = &btrfs_dir_inode_operations;
1517 inode->i_fop = &btrfs_dir_file_operations;
1518 btrfs_set_trans_block_group(trans, inode);
1521 err = btrfs_update_inode(trans, root, inode);
1525 err = btrfs_add_link(trans, dentry, inode);
1529 d_instantiate(dentry, inode);
1531 dir->i_sb->s_dirt = 1;
1532 btrfs_update_inode_block_group(trans, inode);
1533 btrfs_update_inode_block_group(trans, dir);
1536 nr = trans->blocks_used;
1537 btrfs_end_transaction(trans, root);
1540 mutex_unlock(&root->fs_info->fs_mutex);
1543 btrfs_btree_balance_dirty(root, nr);
1547 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1548 size_t page_offset, u64 start, u64 end,
1554 u64 extent_start = 0;
1556 u64 objectid = inode->i_ino;
1558 int failed_insert = 0;
1559 struct btrfs_path *path;
1560 struct btrfs_root *root = BTRFS_I(inode)->root;
1561 struct btrfs_file_extent_item *item;
1562 struct extent_buffer *leaf;
1563 struct btrfs_key found_key;
1564 struct extent_map *em = NULL;
1565 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1566 struct btrfs_trans_handle *trans = NULL;
1568 path = btrfs_alloc_path();
1570 mutex_lock(&root->fs_info->fs_mutex);
1573 em = lookup_extent_mapping(em_tree, start, end);
1578 em = alloc_extent_map(GFP_NOFS);
1583 em->start = EXTENT_MAP_HOLE;
1584 em->end = EXTENT_MAP_HOLE;
1586 em->bdev = inode->i_sb->s_bdev;
1587 ret = btrfs_lookup_file_extent(trans, root, path,
1588 objectid, start, trans != NULL);
1595 if (path->slots[0] == 0)
1600 leaf = path->nodes[0];
1601 item = btrfs_item_ptr(leaf, path->slots[0],
1602 struct btrfs_file_extent_item);
1603 /* are we inside the extent that was found? */
1604 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1605 found_type = btrfs_key_type(&found_key);
1606 if (found_key.objectid != objectid ||
1607 found_type != BTRFS_EXTENT_DATA_KEY) {
1611 found_type = btrfs_file_extent_type(leaf, item);
1612 extent_start = found_key.offset;
1613 if (found_type == BTRFS_FILE_EXTENT_REG) {
1614 extent_end = extent_start +
1615 btrfs_file_extent_num_bytes(leaf, item);
1617 if (start < extent_start || start >= extent_end) {
1619 if (start < extent_start) {
1620 if (end < extent_start)
1622 em->end = extent_end - 1;
1628 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1630 em->start = extent_start;
1631 em->end = extent_end - 1;
1632 em->block_start = EXTENT_MAP_HOLE;
1633 em->block_end = EXTENT_MAP_HOLE;
1636 bytenr += btrfs_file_extent_offset(leaf, item);
1637 em->block_start = bytenr;
1638 em->block_end = em->block_start +
1639 btrfs_file_extent_num_bytes(leaf, item) - 1;
1640 em->start = extent_start;
1641 em->end = extent_end - 1;
1643 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1647 size_t extent_offset;
1650 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1652 extent_end = (extent_start + size - 1) |
1653 ((u64)root->sectorsize - 1);
1654 if (start < extent_start || start >= extent_end) {
1656 if (start < extent_start) {
1657 if (end < extent_start)
1659 em->end = extent_end;
1665 em->block_start = EXTENT_MAP_INLINE;
1666 em->block_end = EXTENT_MAP_INLINE;
1669 em->start = extent_start;
1670 em->end = extent_start + size - 1;
1674 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1675 extent_start + page_offset;
1676 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1677 size - extent_offset);
1678 em->start = extent_start + extent_offset;
1679 em->end = (em->start + copy_size -1) |
1680 ((u64)root->sectorsize -1);
1682 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1683 if (create == 0 && !PageUptodate(page)) {
1684 read_extent_buffer(leaf, map + page_offset, ptr,
1686 flush_dcache_page(page);
1687 } else if (create && PageUptodate(page)) {
1690 free_extent_map(em);
1692 btrfs_release_path(root, path);
1693 trans = btrfs_start_transaction(root, 1);
1696 write_extent_buffer(leaf, map + page_offset, ptr,
1698 btrfs_mark_buffer_dirty(leaf);
1701 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
1704 printk("unkknown found_type %d\n", found_type);
1711 em->block_start = EXTENT_MAP_HOLE;
1712 em->block_end = EXTENT_MAP_HOLE;
1714 btrfs_release_path(root, path);
1715 if (em->start > start || em->end < start) {
1716 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
1720 ret = add_extent_mapping(em_tree, em);
1721 if (ret == -EEXIST) {
1722 free_extent_map(em);
1725 if (failed_insert > 5) {
1726 printk("failing to insert %Lu %Lu\n", start, end);
1734 btrfs_free_path(path);
1736 ret = btrfs_end_transaction(trans, root);
1740 mutex_unlock(&root->fs_info->fs_mutex);
1742 free_extent_map(em);
1744 return ERR_PTR(err);
1749 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
1751 return extent_bmap(mapping, iblock, btrfs_get_extent);
1754 static int btrfs_prepare_write(struct file *file, struct page *page,
1755 unsigned from, unsigned to)
1757 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1758 page->mapping->host, page, from, to,
1762 int btrfs_readpage(struct file *file, struct page *page)
1764 struct extent_map_tree *tree;
1765 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1766 return extent_read_full_page(tree, page, btrfs_get_extent);
1768 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1770 struct extent_map_tree *tree;
1773 if (current->flags & PF_MEMALLOC) {
1774 redirty_page_for_writepage(wbc, page);
1778 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1779 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
1782 static int btrfs_writepages(struct address_space *mapping,
1783 struct writeback_control *wbc)
1785 struct extent_map_tree *tree;
1786 tree = &BTRFS_I(mapping->host)->extent_tree;
1787 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
1791 btrfs_readpages(struct file *file, struct address_space *mapping,
1792 struct list_head *pages, unsigned nr_pages)
1794 struct extent_map_tree *tree;
1795 tree = &BTRFS_I(mapping->host)->extent_tree;
1796 return extent_readpages(tree, mapping, pages, nr_pages,
1800 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
1802 struct extent_map_tree *tree;
1805 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1806 ret = try_release_extent_mapping(tree, page);
1808 ClearPagePrivate(page);
1809 set_page_private(page, 0);
1810 page_cache_release(page);
1815 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
1817 struct extent_map_tree *tree;
1819 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1820 extent_invalidatepage(tree, page, offset);
1821 btrfs_releasepage(page, GFP_NOFS);
1825 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1826 * called from a page fault handler when a page is first dirtied. Hence we must
1827 * be careful to check for EOF conditions here. We set the page up correctly
1828 * for a written page which means we get ENOSPC checking when writing into
1829 * holes and correct delalloc and unwritten extent mapping on filesystems that
1830 * support these features.
1832 * We are not allowed to take the i_mutex here so we have to play games to
1833 * protect against truncate races as the page could now be beyond EOF. Because
1834 * vmtruncate() writes the inode size before removing pages, once we have the
1835 * page lock we can determine safely if the page is beyond EOF. If it is not
1836 * beyond EOF, then the page is guaranteed safe against truncation until we
1839 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1841 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
1847 down_read(&BTRFS_I(inode)->root->snap_sem);
1849 wait_on_page_writeback(page);
1850 size = i_size_read(inode);
1851 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1853 if ((page->mapping != inode->i_mapping) ||
1854 (page_start > size)) {
1855 /* page got truncated out from underneath us */
1859 /* page is wholly or partially inside EOF */
1860 if (page_start + PAGE_CACHE_SIZE > size)
1861 end = size & ~PAGE_CACHE_MASK;
1863 end = PAGE_CACHE_SIZE;
1865 ret = btrfs_cow_one_page(inode, page, end);
1868 up_read(&BTRFS_I(inode)->root->snap_sem);
1873 static void btrfs_truncate(struct inode *inode)
1875 struct btrfs_root *root = BTRFS_I(inode)->root;
1877 struct btrfs_trans_handle *trans;
1880 if (!S_ISREG(inode->i_mode))
1882 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1885 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1887 mutex_lock(&root->fs_info->fs_mutex);
1888 trans = btrfs_start_transaction(root, 1);
1889 btrfs_set_trans_block_group(trans, inode);
1891 /* FIXME, add redo link to tree so we don't leak on crash */
1892 ret = btrfs_truncate_in_trans(trans, root, inode);
1893 btrfs_update_inode(trans, root, inode);
1894 nr = trans->blocks_used;
1896 ret = btrfs_end_transaction(trans, root);
1898 mutex_unlock(&root->fs_info->fs_mutex);
1899 btrfs_btree_balance_dirty(root, nr);
1902 int btrfs_commit_write(struct file *file, struct page *page,
1903 unsigned from, unsigned to)
1905 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
1906 struct inode *inode = page->mapping->host;
1908 btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE);
1910 set_page_extent_mapped(page);
1911 set_page_dirty(page);
1913 if (pos > inode->i_size) {
1914 i_size_write(inode, pos);
1915 mark_inode_dirty(inode);
1920 static int create_subvol(struct btrfs_root *root, char *name, int namelen)
1922 struct btrfs_trans_handle *trans;
1923 struct btrfs_key key;
1924 struct btrfs_root_item root_item;
1925 struct btrfs_inode_item *inode_item;
1926 struct extent_buffer *leaf;
1927 struct btrfs_root *new_root;
1928 struct inode *inode;
1933 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
1934 unsigned long nr = 1;
1936 mutex_lock(&root->fs_info->fs_mutex);
1937 trans = btrfs_start_transaction(root, 1);
1940 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1945 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
1946 objectid, trans->transid, 0, 0,
1949 return PTR_ERR(leaf);
1951 btrfs_set_header_nritems(leaf, 0);
1952 btrfs_set_header_level(leaf, 0);
1953 btrfs_set_header_bytenr(leaf, leaf->start);
1954 btrfs_set_header_generation(leaf, trans->transid);
1955 btrfs_set_header_owner(leaf, objectid);
1957 write_extent_buffer(leaf, root->fs_info->fsid,
1958 (unsigned long)btrfs_header_fsid(leaf),
1960 btrfs_mark_buffer_dirty(leaf);
1962 inode_item = &root_item.inode;
1963 memset(inode_item, 0, sizeof(*inode_item));
1964 inode_item->generation = cpu_to_le64(1);
1965 inode_item->size = cpu_to_le64(3);
1966 inode_item->nlink = cpu_to_le32(1);
1967 inode_item->nblocks = cpu_to_le64(1);
1968 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
1970 btrfs_set_root_bytenr(&root_item, leaf->start);
1971 btrfs_set_root_level(&root_item, 0);
1972 btrfs_set_root_refs(&root_item, 1);
1973 btrfs_set_root_used(&root_item, 0);
1975 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
1976 root_item.drop_level = 0;
1978 free_extent_buffer(leaf);
1981 btrfs_set_root_dirid(&root_item, new_dirid);
1983 key.objectid = objectid;
1985 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
1986 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1992 * insert the directory item
1994 key.offset = (u64)-1;
1995 dir = root->fs_info->sb->s_root->d_inode;
1996 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1997 name, namelen, dir->i_ino, &key,
2002 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2003 name, namelen, objectid,
2004 root->fs_info->sb->s_root->d_inode->i_ino);
2008 ret = btrfs_commit_transaction(trans, root);
2012 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2015 trans = btrfs_start_transaction(new_root, 1);
2018 inode = btrfs_new_inode(trans, new_root, new_dirid,
2019 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2022 inode->i_op = &btrfs_dir_inode_operations;
2023 inode->i_fop = &btrfs_dir_file_operations;
2024 new_root->inode = inode;
2026 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2030 ret = btrfs_update_inode(trans, new_root, inode);
2034 nr = trans->blocks_used;
2035 err = btrfs_commit_transaction(trans, root);
2039 mutex_unlock(&root->fs_info->fs_mutex);
2040 btrfs_btree_balance_dirty(root, nr);
2044 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2046 struct btrfs_trans_handle *trans;
2047 struct btrfs_key key;
2048 struct btrfs_root_item new_root_item;
2049 struct extent_buffer *tmp;
2055 if (!root->ref_cows)
2058 down_write(&root->snap_sem);
2059 freeze_bdev(root->fs_info->sb->s_bdev);
2060 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
2062 mutex_lock(&root->fs_info->fs_mutex);
2063 trans = btrfs_start_transaction(root, 1);
2066 ret = btrfs_update_inode(trans, root, root->inode);
2070 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2075 memcpy(&new_root_item, &root->root_item,
2076 sizeof(new_root_item));
2078 key.objectid = objectid;
2080 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2081 extent_buffer_get(root->node);
2082 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
2083 free_extent_buffer(tmp);
2084 btrfs_set_root_bytenr(&new_root_item, root->node->start);
2085 btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node));
2086 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2092 * insert the directory item
2094 key.offset = (u64)-1;
2095 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2097 root->fs_info->sb->s_root->d_inode->i_ino,
2098 &key, BTRFS_FT_DIR);
2103 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2104 name, namelen, objectid,
2105 root->fs_info->sb->s_root->d_inode->i_ino);
2110 ret = btrfs_inc_root_ref(trans, root, objectid);
2114 nr = trans->blocks_used;
2115 err = btrfs_commit_transaction(trans, root);
2120 mutex_unlock(&root->fs_info->fs_mutex);
2121 up_write(&root->snap_sem);
2122 btrfs_btree_balance_dirty(root, nr);
2126 static unsigned long force_ra(struct address_space *mapping,
2127 struct file_ra_state *ra, struct file *file,
2128 pgoff_t offset, pgoff_t last_index)
2132 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2133 req_size = last_index - offset + 1;
2134 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2137 req_size = min(last_index - offset + 1, (pgoff_t)128);
2138 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2139 return offset + req_size;
2143 int btrfs_defrag_file(struct file *file) {
2144 struct inode *inode = file->f_path.dentry->d_inode;
2145 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2147 unsigned long last_index;
2148 unsigned long ra_index = 0;
2153 mutex_lock(&inode->i_mutex);
2154 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2155 for (i = 0; i <= last_index; i++) {
2156 if (i == ra_index) {
2157 ra_index = force_ra(inode->i_mapping, &file->f_ra,
2158 file, ra_index, last_index);
2160 page = grab_cache_page(inode->i_mapping, i);
2163 if (!PageUptodate(page)) {
2164 btrfs_readpage(NULL, page);
2166 if (!PageUptodate(page)) {
2168 page_cache_release(page);
2172 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2173 page_end = page_start + PAGE_CACHE_SIZE - 1;
2175 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
2176 set_extent_delalloc(em_tree, page_start,
2177 page_end, GFP_NOFS);
2178 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2179 set_page_dirty(page);
2181 page_cache_release(page);
2182 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2186 mutex_unlock(&inode->i_mutex);
2190 static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
2192 struct btrfs_ioctl_vol_args vol_args;
2193 struct btrfs_dir_item *di;
2194 struct btrfs_path *path;
2198 if (copy_from_user(&vol_args, arg, sizeof(vol_args)))
2201 namelen = strlen(vol_args.name);
2202 if (namelen > BTRFS_VOL_NAME_MAX)
2204 if (strchr(vol_args.name, '/'))
2207 path = btrfs_alloc_path();
2211 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2212 mutex_lock(&root->fs_info->fs_mutex);
2213 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2215 vol_args.name, namelen, 0);
2216 mutex_unlock(&root->fs_info->fs_mutex);
2217 btrfs_free_path(path);
2218 if (di && !IS_ERR(di))
2223 if (root == root->fs_info->tree_root)
2224 return create_subvol(root, vol_args.name, namelen);
2225 return create_snapshot(root, vol_args.name, namelen);
2228 static int btrfs_ioctl_defrag(struct file *file)
2230 struct inode *inode = file->f_path.dentry->d_inode;
2231 struct btrfs_root *root = BTRFS_I(inode)->root;
2233 switch (inode->i_mode & S_IFMT) {
2235 mutex_lock(&root->fs_info->fs_mutex);
2236 btrfs_defrag_root(root, 0);
2237 btrfs_defrag_root(root->fs_info->extent_root, 0);
2238 mutex_unlock(&root->fs_info->fs_mutex);
2241 btrfs_defrag_file(file);
2248 long btrfs_ioctl(struct file *file, unsigned int
2249 cmd, unsigned long arg)
2251 struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root;
2254 case BTRFS_IOC_SNAP_CREATE:
2255 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2256 case BTRFS_IOC_DEFRAG:
2257 return btrfs_ioctl_defrag(file);
2264 * Called inside transaction, so use GFP_NOFS
2266 struct inode *btrfs_alloc_inode(struct super_block *sb)
2268 struct btrfs_inode *ei;
2270 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2274 return &ei->vfs_inode;
2277 void btrfs_destroy_inode(struct inode *inode)
2279 WARN_ON(!list_empty(&inode->i_dentry));
2280 WARN_ON(inode->i_data.nrpages);
2282 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2285 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2286 static void init_once(struct kmem_cache * cachep, void *foo)
2288 static void init_once(void * foo, struct kmem_cache * cachep,
2289 unsigned long flags)
2292 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2294 inode_init_once(&ei->vfs_inode);
2297 void btrfs_destroy_cachep(void)
2299 if (btrfs_inode_cachep)
2300 kmem_cache_destroy(btrfs_inode_cachep);
2301 if (btrfs_trans_handle_cachep)
2302 kmem_cache_destroy(btrfs_trans_handle_cachep);
2303 if (btrfs_transaction_cachep)
2304 kmem_cache_destroy(btrfs_transaction_cachep);
2305 if (btrfs_bit_radix_cachep)
2306 kmem_cache_destroy(btrfs_bit_radix_cachep);
2307 if (btrfs_path_cachep)
2308 kmem_cache_destroy(btrfs_path_cachep);
2311 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2312 unsigned long extra_flags,
2313 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2314 void (*ctor)(struct kmem_cache *, void *)
2316 void (*ctor)(void *, struct kmem_cache *,
2321 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2322 SLAB_MEM_SPREAD | extra_flags), ctor
2323 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2329 int btrfs_init_cachep(void)
2331 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2332 sizeof(struct btrfs_inode),
2334 if (!btrfs_inode_cachep)
2336 btrfs_trans_handle_cachep =
2337 btrfs_cache_create("btrfs_trans_handle_cache",
2338 sizeof(struct btrfs_trans_handle),
2340 if (!btrfs_trans_handle_cachep)
2342 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2343 sizeof(struct btrfs_transaction),
2345 if (!btrfs_transaction_cachep)
2347 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2348 sizeof(struct btrfs_path),
2350 if (!btrfs_path_cachep)
2352 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2353 SLAB_DESTROY_BY_RCU, NULL);
2354 if (!btrfs_bit_radix_cachep)
2358 btrfs_destroy_cachep();
2362 static int btrfs_getattr(struct vfsmount *mnt,
2363 struct dentry *dentry, struct kstat *stat)
2365 struct inode *inode = dentry->d_inode;
2366 generic_fillattr(inode, stat);
2367 stat->blksize = 256 * 1024;
2371 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2372 struct inode * new_dir,struct dentry *new_dentry)
2374 struct btrfs_trans_handle *trans;
2375 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2376 struct inode *new_inode = new_dentry->d_inode;
2377 struct inode *old_inode = old_dentry->d_inode;
2378 struct timespec ctime = CURRENT_TIME;
2379 struct btrfs_path *path;
2382 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2383 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2387 mutex_lock(&root->fs_info->fs_mutex);
2388 trans = btrfs_start_transaction(root, 1);
2390 btrfs_set_trans_block_group(trans, new_dir);
2391 path = btrfs_alloc_path();
2397 old_dentry->d_inode->i_nlink++;
2398 old_dir->i_ctime = old_dir->i_mtime = ctime;
2399 new_dir->i_ctime = new_dir->i_mtime = ctime;
2400 old_inode->i_ctime = ctime;
2402 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2407 new_inode->i_ctime = CURRENT_TIME;
2408 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2412 ret = btrfs_add_link(trans, new_dentry, old_inode);
2417 btrfs_free_path(path);
2418 btrfs_end_transaction(trans, root);
2419 mutex_unlock(&root->fs_info->fs_mutex);
2423 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2424 const char *symname)
2426 struct btrfs_trans_handle *trans;
2427 struct btrfs_root *root = BTRFS_I(dir)->root;
2428 struct btrfs_path *path;
2429 struct btrfs_key key;
2430 struct inode *inode;
2437 struct btrfs_file_extent_item *ei;
2438 struct extent_buffer *leaf;
2441 name_len = strlen(symname) + 1;
2442 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2443 return -ENAMETOOLONG;
2444 mutex_lock(&root->fs_info->fs_mutex);
2445 trans = btrfs_start_transaction(root, 1);
2446 btrfs_set_trans_block_group(trans, dir);
2448 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2454 inode = btrfs_new_inode(trans, root, objectid,
2455 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2456 err = PTR_ERR(inode);
2460 btrfs_set_trans_block_group(trans, inode);
2461 err = btrfs_add_nondir(trans, dentry, inode);
2465 inode->i_mapping->a_ops = &btrfs_aops;
2466 inode->i_fop = &btrfs_file_operations;
2467 inode->i_op = &btrfs_file_inode_operations;
2468 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2469 inode->i_mapping, GFP_NOFS);
2470 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
2472 dir->i_sb->s_dirt = 1;
2473 btrfs_update_inode_block_group(trans, inode);
2474 btrfs_update_inode_block_group(trans, dir);
2478 path = btrfs_alloc_path();
2480 key.objectid = inode->i_ino;
2482 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2483 datasize = btrfs_file_extent_calc_inline_size(name_len);
2484 err = btrfs_insert_empty_item(trans, root, path, &key,
2490 leaf = path->nodes[0];
2491 ei = btrfs_item_ptr(leaf, path->slots[0],
2492 struct btrfs_file_extent_item);
2493 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2494 btrfs_set_file_extent_type(leaf, ei,
2495 BTRFS_FILE_EXTENT_INLINE);
2496 ptr = btrfs_file_extent_inline_start(ei);
2497 write_extent_buffer(leaf, symname, ptr, name_len);
2498 btrfs_mark_buffer_dirty(leaf);
2499 btrfs_free_path(path);
2501 inode->i_op = &btrfs_symlink_inode_operations;
2502 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2503 inode->i_size = name_len - 1;
2504 err = btrfs_update_inode(trans, root, inode);
2509 nr = trans->blocks_used;
2510 btrfs_end_transaction(trans, root);
2511 mutex_unlock(&root->fs_info->fs_mutex);
2513 inode_dec_link_count(inode);
2516 btrfs_btree_balance_dirty(root, nr);
2520 static struct inode_operations btrfs_dir_inode_operations = {
2521 .lookup = btrfs_lookup,
2522 .create = btrfs_create,
2523 .unlink = btrfs_unlink,
2525 .mkdir = btrfs_mkdir,
2526 .rmdir = btrfs_rmdir,
2527 .rename = btrfs_rename,
2528 .symlink = btrfs_symlink,
2529 .setattr = btrfs_setattr,
2530 .mknod = btrfs_mknod,
2531 .setxattr = generic_setxattr,
2532 .getxattr = generic_getxattr,
2533 .listxattr = btrfs_listxattr,
2534 .removexattr = generic_removexattr,
2537 static struct inode_operations btrfs_dir_ro_inode_operations = {
2538 .lookup = btrfs_lookup,
2541 static struct file_operations btrfs_dir_file_operations = {
2542 .llseek = generic_file_llseek,
2543 .read = generic_read_dir,
2544 .readdir = btrfs_readdir,
2545 .unlocked_ioctl = btrfs_ioctl,
2546 #ifdef CONFIG_COMPAT
2547 .compat_ioctl = btrfs_ioctl,
2551 static struct extent_map_ops btrfs_extent_map_ops = {
2552 .fill_delalloc = run_delalloc_range,
2553 .writepage_io_hook = btrfs_writepage_io_hook,
2554 .readpage_io_hook = btrfs_readpage_io_hook,
2555 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2558 static struct address_space_operations btrfs_aops = {
2559 .readpage = btrfs_readpage,
2560 .writepage = btrfs_writepage,
2561 .writepages = btrfs_writepages,
2562 .readpages = btrfs_readpages,
2563 .sync_page = block_sync_page,
2564 .prepare_write = btrfs_prepare_write,
2565 .commit_write = btrfs_commit_write,
2567 .invalidatepage = btrfs_invalidatepage,
2568 .releasepage = btrfs_releasepage,
2569 .set_page_dirty = __set_page_dirty_nobuffers,
2572 static struct address_space_operations btrfs_symlink_aops = {
2573 .readpage = btrfs_readpage,
2574 .writepage = btrfs_writepage,
2575 .invalidatepage = btrfs_invalidatepage,
2576 .releasepage = btrfs_releasepage,
2579 static struct inode_operations btrfs_file_inode_operations = {
2580 .truncate = btrfs_truncate,
2581 .getattr = btrfs_getattr,
2582 .setattr = btrfs_setattr,
2583 .setxattr = generic_setxattr,
2584 .getxattr = generic_getxattr,
2585 .listxattr = btrfs_listxattr,
2586 .removexattr = generic_removexattr,
2589 static struct inode_operations btrfs_special_inode_operations = {
2590 .getattr = btrfs_getattr,
2591 .setattr = btrfs_setattr,
2594 static struct inode_operations btrfs_symlink_inode_operations = {
2595 .readlink = generic_readlink,
2596 .follow_link = page_follow_link_light,
2597 .put_link = page_put_link,